SnS, Mossbauer

DNA], with varying ligand organotin(IV) molar ratios, frozen at 77.3 K, were monitored by Sn Mossbauer spectroscopy. 

The structure and dynamics for some representatives of the series of [Me2Sn(IV)] , [MeSn(IV)] , and inorganic Sn(IV) complexes with (S, Nj-contain-ing donors have been determined by Sn Mossbauer spectroscopy and are reported in Ref. (292). 

Barbieri, R. Pellerito, L. Ruisi, G. Silvestri, A. Barbieri-Paulsen, A. Barone, G. Posante, S. Rossi, M. Sn Mossbauer spectroscopy studies on the interaction of organotin(IV) salts and complexes with biological systems and molecules. In Gianguzza, A. Pelizzetti, E. Sammartano, S. (Eds.), Chemical Processes in Marine Environments, Springer Verlag, Berlin, 2000 Chapter 12, p. 229. 

About 1000 papers are published annually on organotin chemistry, and we have been able to include only 5% of these. We have deliberately avoided treating in depth those aspects of the subject that have been thoroughly reviewed recently, and, in particular, we have avoided duplicating the excellent surveys of the use of organotin compounds in organic synthesis (4), of " "Sn Mossbauer spectroscopy (5-9), and of Sn NMR spectroscopy (10-12) that are available. 

The various, solid-state stereochemistries just described may often be distinguished fairly readily by " Sn Mossbauer spectroscopy 5-9, 452), particularly from the value of the quadrupole splitting parameter, AEq (see Table II). 

Sn Mossbauer Quadrupole Splittings for Organotin Compounds OF Known Stereochemistry... 

The Sn Mossbauer data for Sn7S2Brio, Sn4SeBr, and Sn4TeBr, have been measured, and compared with those of the parent halides and chalcogenides. The data are consistent with a random distribution of halide and chalcogenide anions (104). Thus far, the reflection spectra of a few tin(IV) compounds assumed to be semiconductors have... 

Applications of " Sn Mossbauer Spectroscopy to the Study of Organotin Compounds, 9, 21... 

Ni3Sn2S2 Valence states of nickel, tin, and sulfur in the ternary chalcogenide, and " Sn Mossbauer investigations, XPS and band structure calculations... 

Carbon-supported Ru-Sn catalyst Ru and Sn Mossbauer measurements were performed to investigate catalysts of ruthenium and tin supported on activated carbon (Ru-Sn/C). The samples were subjected to different reducing and oxidizing treatments. The presence of tin leads to a substantial increase of the Lamb-Mossbauer factor of the metallic Ru-particles showing that tin strengthens the attachment of the particles to the support. The close contact between the two metals appears to be decisive for the formation of catalytically active sites (Ru-Sn and Ru-SnOj,-)... 

Shinjo et al. have investigated a number of multilayers and interfaces, also by Sn Mossbauer spectroscopy [437 39], as well as different kinds of multilayers of Au/TM with transition metals TM = Fe, Co, Ni [440 142]. 

In the following section, we describe the case of adsorption of a Sn complex onto a palladium oxide suspension. In an alkaline medium (a basic PdO hydrosol), chlorides in the SnCL complex are substituted in the coordination sphere of tin(IV) by hydroxo anions, which are in excess, yielding the stannate Sn(OH)g complex. The Sn Mossbauer spectroscopy spectrum of a bimetallic sol (frozen in liquid nitrogen) is compared with a true stannic solution. At the same tin concentration, it shows the changes in the Sn environment due to adsorption onto the PdO surface (Fig. 13.27). The isomer shift S is found to be close to zero for the stannate solution and increases when contacted with the PdO suspension, indicating a modification of the coordination sphere of tin. The increase in 5 can be correlated to an increase in the core level electronic density of tin. The quadrupole splitting A, is related to a modification of the symmetry of the close environment of tin, due to adsorption of Sn(OH)g complexes onto the PdO colloidal nanoparticles. 

FIGURE 13.35. Effect of reduction temperature on kinetic constants and % of alloyed phases determined by Sn Mossbauer spectroscopy. 

The electronic spectra of cis- and trans-[FeX2(CNAr) ] (X = Cl and/or SnCl3) and [Fe(SnCl3)(CNAr)5]C104 (Ar = p-MeOC H ) have been reported and for the first time a splitting of the state has been observed for a low-spin Fe compound. The tin atom is formally in the oxidation state (ii) however. the Sn Mossbauer shift lies in the region expected for... 

However, " Sn Mossbauer spectroscopy allows even much better characterization of Pt/Sn bimetallic nanoparticles. For example, with silica-deposited platinum-tin particles of homogeneous size (1.7 and 4.0nm, respectively, for two different samples) it has been demonstrated that (Figure 2.17) ... 

T<155) " Sn Mossbauer spectra of Sn[N(SiMe3)2]2, Sn[NCH2CH2]2 and [Sn(NMe2)(lt-NMe2)]2 have been recorded " those of Sn[(NPr )2CjijHg-l,8] (98 < T < 255) were used to study the Sn-ligand bond flexibility in this compound, which has an... 

Anionic Rearrangement of Organosilicon and Germanium Compounds, 16, 1 Application of 13C-NMR Spectroscopy to Organo-Transition Metal Complexes, 19, 257 Applications of " "Sn Mossbauer Spectroscopy to the Study of Organotin Compounds, 9, 21... 

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